package com.grammer.thread;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SimplePriorities implements Runnable {
    private int countDown = 5 ;
    private volatile double d ;
    private int priority ;

    public SimplePriorities(int pri){
        this.priority = pri;
    }

    @Override
    public String toString(){
       return Thread.currentThread() +": "+countDown ;
    }
    @Override
    public void run() {
        Thread.currentThread().setPriority(priority);
        while(true){
            //An expensive. interruptable operation
            for(int i=1;i<100000;i++){
                d+= (Math.PI+Math.E)/(double)i;
                if(i%1000==0){
                    Thread.yield();
                }
            }
            System.out.println(this);
            if(--countDown == 0){
                return ;
            }
        }
    }

    public static void main(String[] args){
        ExecutorService exec = Executors.newCachedThreadPool();
        for(int i=0;i<5;i++){
            exec.execute(new SimplePriorities(Thread.MIN_PRIORITY));
        }
        exec.execute(new SimplePriorities(Thread.MAX_PRIORITY));
        exec.shutdown();
    }
}
